The key thing I'd like to avoid is version pinning where we have touprev a higher level spec (e.g. the wheel format) just because a lowerlevel spec (e.g. compatibility tags) was updated in a backwardscompatible way. Using PEP numbers for cross-links betweenspecifications the way we do now doesn't give us that.

So, using that as an example, suppose we used a series focused namingconvention like: